had an interesting exp cutting for my last weightliftin comp, lost about 6kg in 24h. weigh in at 8am and lifting at 3-4pm made it all feasible.
-cut carbs, less glycogen = less water
-kept fat and protein high...any diff to actual body comp other than water irrelevant in this time frame
-lots of water leading upto, then cut that night...body keeps flushing
-hot bath....really helped but also scary...the combo of being dehydrated + then vasodilating all of your peripheral vasculature really drops your blood pressure and I had a pretty intense autonomic response to this drop in BP. really rapid HR, dizziness, tingling peripheries.....had to lay down for a while to let it settle, I was home alone so actually got a bit anxious id done something stupid
-wore a tonne of clothes.
in the morning felt pretty good. was obviously dehydrated af. slept well though. dry mouth = chewing gum helps. turned up weighed in then took on litres and litres of fluid...with food/salt/other electrolytes obviously and was feeling 100% a couple of hours later!